Tech Question: Crankset Ring Spacing, 11 sp

[Gothard]

Would anyone who has access to technical documents know the spacing of the crankset chainrings for 11 sp Shimano and Campy?
I want to use a specific crankset that is not originally 11 sp, and wonder if there will be issues in case I go electric shifting.

[kgreene10]

Someone who actually knows the answer to your question will no doubt reply soon, but I just want to share that I use 10sp Red cranks (Quarq) with my DA 9000 and it works beautifully - best front shifting I have ever experienced. (I'm attempting to ignore the Di2 shifting I tried recently at a bike show.)

[katematt]

FWIW I use a 10 spd Truvativ 53/39 crank with a 11 spd Athena group. Works very well and quiet.

[oldpotatoe]

Would anyone who has access to technical documents know the spacing of the crankset chainrings for 11 sp Shimano and Campy?
I want to use a specific crankset that is not originally 11 sp, and wonder if there will be issues in case I go electric shifting.

I don't know specifics for 11s ring spacing but I have tried to use 10s spaced rings on 11s EPS and chain rub at one extreme or another is the result. I imagine 11s shimano Di2 is the same but try it, if rub, get 11s rings.

For just below, non EPS or Di2 rings work, sorta. In the stand generally because there is so little pedal pressure but while riding, you really need stiff(er) CRs.

[Joachim]

The OP mentions electronic shifting. The issue is not whether 10spd chainrings are compatible with 11 spd, but if 10spd chainrings (Campy?) will be compatible with electronic shifting. The older 10spd Campy rings are not as stiff as the new 11 spd ones for electronic shifting. In fact, there was a change made from Campy 11spd (non-EPS) rings to 11spd EPS rings, which helped with the increased torque of the front der. OldP can chime in, but I distinctly remember him saying that for optimal EPS shifting, use the 11spd EPS chainrings.

[Scooper]

Would anyone who has access to technical documents know the spacing of the crankset chainrings for 11 sp Shimano and Campy?
I want to use a specific crankset that is not originally 11 sp, and wonder if there will be issues in case I go electric shifting.

I can't find the chainring spacing for the 11-s FC-9000 crankset, but the Campy 11-s cranksets have 7.7mm chainring spacing.

http://i32.photobucket.com/albums/d7/k4drd/Bicycles/Campagnolo/ultratorquecranksetdimensions-Campagnolo_06_12_zpsb4dc32b3.jpg

[Gothard]

And Scooper for the win!

Explanation: I will be using a TA Carmina crankset on my next build, with 32/48 rings. I will likely need to tweak the spacing to get close to the specified value for electric shifting if I go this way.

[CPP]

Next build???????????
;)

[Gothard]

Hi Chris!
Flies like fire....

[CPP]

Sooooooooh?????

[CPP]

George always has something awesome in the works!